Based on the structures discussed about neuronal anatomy, an action potential is more likely from axon hillock to dendrite. from axon terminal to soma. from soma to axon terminal.
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In a neuron, where is the greatest concentration of voltage-gated sodium and voltage-gated potassium channels? axon terminal soma dendrites axon hillock axon Question 46 The all-or-none principle, associated with the action potential, states that once membrane potential reaches threshold, an action potential will be generated and that action potential will always be the same magnitude. the positive feedback loop for the sodium channel is terminated by the inactivation gate. following an action potential, the membrane will be repolarized by the opening of a potassium channel. all of the action potentials will be generated from the axon hillock. there is a positive feedback loop for sodium channels that results in a rapid membrane depolarization.
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Graded potentials: (list all correct answers) (A) always result in triggering an action potential, (B) sum temporally, (C) sum spatially, (D) result from open voltage-gated channels, (E) vary in magnitude. To hyperpolarize the dendritic membrane of a neuron you must open: (A) a cation channel, (B) a calcium channel, (C) a potassium channel, (D) a chloride channel, (E) C or D. Once the axon hillock reaches the threshold potential: (A) the neuron fires, (B) the neuron's action potentials begin, (C) nearby voltage gated sodium channels start to open, (D) nearby voltage gated potassium channels start to open, (E) all of the above occur when an axon hillock receives a threshold potential. An action potential generated in an excitable membrane: (A) decreases in magnitude as it moves down the membrane, (B) generates a local current that depolarizes adjacent membrane to threshold potential, (C) varies in magnitude depending on the initial strength of the stimulus, (D) A & B, (E) B & C.
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